National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Mostly Cloudy

83°F

28°C

Humidity 57%
Wind Speed S 3 mph
Barometer 30.17 in (1021.5 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 18 May 9:54 am EDT
Extended Forecast for

3 Miles SW Williamstown NJ

Heat Advisory May 18, 12:00pm until May 19, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: Sunny, with a high near 92. South wind 5 to 10 mph.

    High: 92 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. South wind 5 to 10 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. South wind 5 to 10 mph.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 94. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 94 °F

    Sunny then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers after 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.

    High: 69 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.

    High: 65 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 92. South wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 68. South wind 5 to 10 mph.
Tuesday
Sunny, with a high near 95. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 71. South wind 5 to 10 mph.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 94. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers after 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.
Thursday Night
Mostly cloudy, with a low around 50.
Friday
A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.
Friday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Saturday
Showers likely. Mostly cloudy, with a high near 70. Chance of precipitation is 70%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 56. Chance of precipitation is 70%.
Sunday
A chance of showers. Mostly cloudy, with a high near 74. Chance of precipitation is 50%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Williamstown NJ
 39.65°N 75.01°W (Elev. 118 ft)
Last Update:
4:09 am EDT May 18, 2026
Forecast Valid:
10am EDT May 18, 2026-6pm EDT May 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation